A researcher is investigating whether a new fertilizer affects the yield of tomato plants. As part of an experiment, 20 plants will be randomly assigned the new fertilizer and 20 will be assigned the current fertilizer. The mean number of tomatoes produced per plant will be recorded for each fertilizer, and the difference in the sample means will be calculated. a)A matched-pairs tt-interval for a mean difference b)A two-sample tt-interval for a difference between sample means c)A two-sample tt-interval for a difference between population means d)A one-sample tt-interval for a sample mean e)A one-sample tt-interval for a population mean

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Q: A. B & c

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Q: (a) State the null hypothesis H and the alternate hypothesis H,·

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A: